ce4bb083c0
ARM stores the Thumb state in the least significant bit of the function pointers. When compiling for ARM or Thumb, as all instructions are at least 16-bit aligned, ignore the LSB when computing the prefix hash location, so we can support both pure Thumb and mixed ARM/Thumb binaries. Fixes #62936 Reviewed By: MaskRay, simon_tatham Differential Revision: https://reviews.llvm.org/D152484
27 lines
1.2 KiB
LLVM
27 lines
1.2 KiB
LLVM
; RUN: opt -S -passes=kcfi %s | FileCheck --check-prefixes=CHECK,NOARM %s
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; RUN: %if arm-registered-target %{ opt -S -passes=kcfi -mtriple=thumbv7m-unknown-linux-gnu %s | FileCheck --check-prefixes=CHECK,ARM %s %}
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; CHECK-LABEL: define void @f1(
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define void @f1(ptr noundef %x) {
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; ARM: %[[#FINT:]] = ptrtoint ptr %x to i32
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; ARM-NEXT: %[[#FAND:]] = and i32 %[[#FINT]], -2
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; ARM-NEXT: %[[#FPTR:]] = inttoptr i32 %[[#FAND]] to ptr
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; ARM-NEXT: %[[#GEPI:]] = getelementptr inbounds i32, ptr %[[#FPTR]], i32 -1
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; NOARM: %[[#GEPI:]] = getelementptr inbounds i32, ptr %x, i32 -1
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; CHECK-NEXT: %[[#LOAD:]] = load i32, ptr %[[#GEPI]], align 4
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; CHECK-NEXT: %[[#ICMP:]] = icmp ne i32 %[[#LOAD]], 12345678
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; CHECK-NEXT: br i1 %[[#ICMP]], label %[[#TRAP:]], label %[[#CALL:]], !prof ![[#WEIGHTS:]]
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; CHECK: [[#TRAP]]:
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; CHECK-NEXT: call void @llvm.debugtrap()
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; CHECK-NEXT: br label %[[#CALL]]
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; CHECK: [[#CALL]]:
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; CHECK-NEXT: call void %x()
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; CHECK-NOT: [ "kcfi"(i32 12345678) ]
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call void %x() [ "kcfi"(i32 12345678) ]
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ret void
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}
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!llvm.module.flags = !{!0}
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!0 = !{i32 4, !"kcfi", i32 1}
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; CHECK: ![[#WEIGHTS]] = !{!"branch_weights", i32 1, i32 1048575}
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